Method of depositing rubber



I Patented Oct. 5, 1937 l I V UNITED STATES PATIENT 1;

DIE'IHOD OF DEPOSITING RUBBER Andrew Szegvari, Akron, Ohio, assignor toAmerican Anode, Inc., Akron, Ohio, a eorporation of Delaware r NoDrawing, Original application'0ctober29,

i930, SerialQNo. 492,094. Divided and this application January 31, 1935,Serial No. 4,310

9 Claims. (01. 18-41) This invention relates to'the .art of rubberrunning Water to remove Water-soluble submsnnfaoture, d u a y to th rduct stances, including the coagulanti. The adhesive of raised designs,lettering, etc., of rubber, as we l rubber isomer, however, beinginsoluble in water, asrubber coatings over portions only of objects.remains between the rubber and metal as a thin It has heretofore beenproposed to manuiacfilm which .causes the rubber to adhere per- 5 ture,rubber articles or produce rubber coatings manently to the metal aftervulcanization. by .dipping a form. successively in a liquid coagu-Paper, wood, or other fibrous material is prolant and in liquid latex,the film of coagulant revided with a decorative coating over a portionof ma -11 g n the form Causing e oagulation of its surface by printingon the surface with a thick 10 he s q ly pp d e sp y rubber cementcontainingsapproximately of known process, however, has not been adaptedto acetic acid, or an equivalent amount of any of the production ofdiscontinuous coatings, or coatthe well known coagulants, such as thosehereinings possessing a variable thickness. after mentioned, in solutionin water or 'an or- ,An object of this invention is accordingly t ganicsolvent such .as alcohol, ether, acetone, or

15 production of dipped u b p duc s of v ryi an ester. Afterthe cementhas partially dried 15 thickness. Another object is the production ofthe fibrous material is immersed in latex which rubber deposits orcoatings over only the desired is'coagulated on the treated portion ofth surlimited portion of the surface of a base or form. face'bycontactwith the acid-containing cement.

A further object is theproduction of decorative Theun'coagulatedlatex iswashed ofi the und s s lettering, e -g rubber. articles treatedsurfaces, for example, by successive treat- 20 Other objects will beevident from the following ment with'a solution of of soap and /2%description of the invention. ammonia, a solution containing ammonia,

e inv i is practiced by pr v ding a base and then ordinary tap water.Such decorative form With a film f coagulant'over a portio coatings maypossess almost any desired outline only of its surface, and thenbringing the coagufrom the simplest figures to the most complex, 25lant-coated surfaces in association with a body a d may v i l l tt i fth outlines o a ooagulable u us dispersion f rubber or of the coatingsare very sharp and distinct. like'substanees. he t y be pp Rubberarticles may be provided with raised y us n pra y ra sf n rom a orembossed lettering or other designs, which may other (surface, etc., andmay be associated with be in contrasting colors from the rubber base, by30 the aqueous disper i n y immersion r applying a coagulant to asuitable base by printby fl o sp y t dispersion ve the ing it thereon,spraying through a stencil, etc. coagulant-treated surface. T Forexample, a felt pad is saturated with a solu- Where an object s to be pd With D tion of calcium nitrate in acetone or methanol,

as manent coatin of rubber ver a p i only of and a rubber stamp with asurface of the desired its surface, an ve substance is preferablyconfiguration is moistened with the coagulant, app d t t portion of itssurface either which is transferred to a sheet of calendered fore thecoagulant is applied or simultaneously paper by a printing operation.The paper is therew h For p 10 parts of gl thereupon immersed in acolored latex. After 40 acetic acid is cautiously stirred into asolution of short time the paper is removed and the excess 40 15 partsof an adhesive, artificial rubber isomer uncoagulated latex washed offas described in the in 100 parts benzol. The adhesive rubber isomerspreceding paragraph The rubber letters or other disclose in the patentto Geer, 1,617,533, of designs are transferred to the rubber article,Feb. 5, 19 ar particularly b e. A platwhich is preferably unvulcanized,by pressing the ins a for supporting metallic articles While side of thepaper which carries the rubber dethey are electroplated has the areaswhich are to posits firmly against the article and th stripremain bareand conduct the current masked ping Qff the paper; The rubber may th b Wp p other Suitable material, whereupon vulcanized as usual, preferablyin open steam or the remainder of the surface is coated with a dry h t,t should he noted th t in th process thin layer of the above Solution bySprayingthe lettering is twice transferred, once from the 50 The masksare ved and the rack is dipped stamp to the paper and once from thepaper to in a vuloanizable latex until the desired thickness the rubberarticle, hence the letters in the stamp of rubber is coagulated. Theexcess uncoagulated should not be reversed as in ordinary type, butlatex is washed off the untreated portions of the should be made exactlyas they are to appear on rack and the deposited rubber is Washed in hotthe finished article. If desired, different letters 55forqziiiiferentportions of adesign niay be'produced in difl'erent'colors andoseparately transferred to V V the rubber article-inthepredeterminedlocation, It' is': likewisepossibleto produce raiseddesigns or lette'ring directly on'the rubber by apply ing thecoagulantdirectly'thereto and imme'rsing'the rubber article'itselftin thelaQtexLfjThe L lettering may even be producedfoniasheet' of ,7unvulcanized rubber which is thencut out in F 1 "theform' of amedallionor manuiacturers label;-

andiamxed to the rubber article as a'oomplete nnit. This process isalso: applicabletothe trans-i i V f fer of rubber letters tothesurfbce's of other sub-, 7 j V stances such as metal, wood,paper;fetc.,r'anflad- 1 hesive 'being-preierably employedin' thisfniodiTfication, V

r g 'Inthe'V examplesgiven above jcei'tam specific f coag ants have beendescribed, butfjit is to be understood .thatr other 'coagulants may besubgg'stituted therefor; "For example, saltsoffpolyvag le'nt in'etals,such as 'magnesiurn' chloride, calcium chloride, calcium' mtrape-,;oa1om1 home; 7 I 11 l fld a l i um h fld Ls ma e 1 em o e e a dn er? eter. wit ai r r 5 acid, infs olutlon in 'waterforan organic solvent"such. asf' lalcohol ether, acetone, anester, etc.

f' r 'I'hefcoa'gulant mayt'consistr or a free I acid such asfonnicyaceticj citric, lactic,rhydrochlor ic,'etc.} a v V in: anappropriate solvent or. diluent. The'coag 1 3 V ulant may containcolloids, high-boiling; solv n s,

V flwetting agents, etc.,- to.m od iIy its propert s 1f particular uses;l

' I "lheaqueousldispersionniaybe any natural or" artificial dispersiononf rubber or a like substance,

Q including natural latices or caoutchouc and jguttaeperchmvartificialdispersions of crude rub;

ber, synthetic :'-rubber, reclaimedgrubber rubber isomers; etc.Thedispersion 'be'conce ia 'trated, orvulcanized,' or otherwise treatedbefore 1 4 9 11513 used,jand may contain pigments, softeners, W

vulcanizing agents, or other'additions. r

o It is therefore to be understood that this manf tio'n is' not limitedto 'theexamples enumerated above, which are merely illustrative ofcertain f manners of carrying out myeinvention, but that numerousmodifications may be introduced with-.

v out; exceedingthe spirit and scopeof the vinven- 7 tion as defined inthe appended claims. 'Thisa'pplication is a division of myf'copendingso; application serial :No. 492,094 filed October '29,

:1930,which has matured'i'nto U; s. Patent No. 1,989,717,:g'rantd Feb.5, 1 935. -1 y-romim:

plying latex toi theothus'treated base. I y a 6.' A method of formingarubber a.rticle com prising associating a. porous rubber layer'containeI A ingfa latex coagulant in the intersticesthe'reofi i withadeposition: base, andapplyinglatex to thef [interstices thereof.- 2 rfluid rubber cement containing: a liquidcoagu lant forlatex, allowingthe ,cementtordry at least 7 7 solution of rubber containing alatexcoagulantf' and niaterial which evaporates less readily than the rubbersolvent and which is capable of effect ing; setting'ot'the compositionto a non-flowing gel on evaporation of a portion ofthe rubber solvent,allowing the volatilerconstituentsof the' compositionvto evaporate atleast until setting occursand applying-latex'to the thus treated base. 1r a a 3. A method of forming a rubber article come "prising 'applying toa basea fluid organic solvent solution" of rubber containing an 7aqueousr'solu-o 7 tion of a latex coagulant,. allowing the organicsolvent to evaporate at least until the composion sa et to a no -flow nL-a diplrine latex to'the thus treated'basef 7 N v v 4, A method offorming arubber article com{ 7 pfi rassoc a i anon-fl w rubber gel con-ftaining an aqueous solution of a latex coagulant 5 I distributedtherethroughiwitha deposition base,: r

and applying latex tothe treated base. E1

latex coagulant} with, a deposition base, and ap-;

thus t'reatedgbase.

#7. A deposition 'form' for thecoagulationi ofe latex thereon comprisinga base and a coating on e atleast abortion of'saidbase comprising alnon-4o flowing rubber gel containing an aqueous solution F of alatexco-agulant. distributed therethrough 'f H 8.'.A deposition form forthe coagulation o'i latex thereon oomprisinga base'and a co'atingon atleast a-portion of said base comprising a porous fggl 1 rubber layercontaining a latex coagulant in 9; A deposition form for the coa gulationi ot latex thereon comprising a base and acoating on; l 1 atleast a portion of; said base1comprising a non- 5 9 7 flowing rubbergel'containing'an aqueoussolution i a of a salt which is a latexcoagulant'distributed H i by .7 j V therethrough. T

'1 The n ethod' 'of forminga' rubber deposit 5? i which comprisesapplying to a. depositionbase a f Anminwsznovanr 5. .A methodrof forminga. rubberarticle coniel, prising associatinga non-flowing rubbergelcQn-Q --i V r V taining an aqueous sfolutionofa saltwhich isj a j V

